body {
    background-color: white;
}

#header {
    margin-left: auto;
    margin-right: auto;
    text-align:center;
    height:100px;
    background-color:DodgerBlue;
    font-size:90px;
    font-family:Arial;
    color:white;
}

#navi {
    margin-left: 0%;
    margin-right: auto;
    text-align:center;    
    width: auto;
    font-size:25px;
    background-color:black;
    border: 5px solid blue;
    padding: 10px;
    color:white;
}

#content {
    font-family:Arial;
    font-size:20px;   
}